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Apparatus and method for generating radio frequency signals

A technology of radio frequency signals and signals, applied in digital transmission systems, multi-carrier systems, electrical components, etc.

Active Publication Date: 2021-03-02
APPLE INC
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Problems solved by technology

However, processing wide bandwidth RF signals using polar architectures is problematic

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  • Apparatus and method for generating radio frequency signals
  • Apparatus and method for generating radio frequency signals
  • Apparatus and method for generating radio frequency signals

Examples

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Embodiment Construction

[0020] Various examples will now be described more fully with reference to the accompanying drawings in which some examples are shown. In the drawings, the thickness of lines, layers and / or regions may be exaggerated for clarity.

[0021] Therefore, while further examples are capable of various modifications and alternative forms, some specific examples thereof are shown in the drawings and will be described in detail later. However, this detailed description does not limit further examples to the particular forms described. Further examples may cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure. Throughout the description of the drawings, the same numerals refer to the same or similar elements, and compared with each other, these elements may be implemented identically or in a modified form while providing the same or similar functions.

[0022] It will be understood that when an element is referred to as being "connect...

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Abstract

An apparatus for generating a radio frequency signal based on a symbol within a constellation diagram is provided. The constellation diagram is spanned by a first axis representing an in-phase component and an orthogonal second axis representing a quadrature component. The apparatus includes a processing unit configured to select one of a plurality of segments of the constellation diagram containing the symbol. The segment is delimited by two radially extending boundaries, wherein the two radially extending boundaries span an opening angle of the segment that is different from 90°. The processing unit is further configured to calculate a first coordinate of the symbol with respect to a third axis, and a second coordinate of the symbol with respect to a fourth axis. At least one of the third axis and the fourth axis coincides with one of the two radially extending boundaries. The apparatus further includes a plurality of digital-to-analog converter cells configured to generate the radio frequency signal using the first coordinate and the second coordinate.

Description

technical field [0001] Examples relate to wireless transmitter technology. In particular, examples relate to apparatus and methods for generating radio frequency signals based on symbols in a constellation diagram. Background technique [0002] Modern wireless transmitters (eg, for cellular, Bluetooth or Wi-Fi communications) are dominated by two architectures: Cartesian (I / Q) transmitters and polar transmitters. [0003] Cartesian transmitters use radio frequency digital-to-analog converters (RF-DACs) to generate modulated radio frequency (RF) signals directly from complex-valued symbols having in-phase and quadrature components. Two local oscillator (LO) signals of the same frequency but shifted by 90° are used to clock the RF-DAC. The LO signal represents the in-phase and quadrature axes (vectors) of the constellation diagram. Cartesian architectures can handle high bandwidth modulation schemes but are less efficient than polar architectures. [0004] In polar coordin...

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Application Information

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IPC IPC(8): H04L27/36
CPCH04L27/362H04L27/3444
Inventor J·扎列斯基C·迈尔J·马尔科维奇B·奈乌拉乌特尔
Owner APPLE INC
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